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greybus: control: add interface suspend prepare operation

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Add the AP implementation for the Greybus Control Interface Suspend
Prepare Operation. AP uses this Operation during the Suspend transition
to request the Interface to enter a low-power mode after it detects a
subsequent UniPro link hibernation.

Signed-off-by: David Lin <dtwlin@google.com>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Alex Elder <elder@linaro.org>
This commit is contained in:
David Lin 2016-07-07 22:07:00 -05:00 committed by Alex Elder
parent f61908f94a
commit f53be0eaf0
3 changed files with 51 additions and 0 deletions
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35
drivers/staging/greybus/control.c
View File

@ -348,6 +348,41 @@ int gb_control_bundle_activate(struct gb_control *control, u8 bundle_id)
return 0;
}
static int gb_control_interface_pm_status_map(u8 status)
{
switch (status) {
case GB_CONTROL_INTF_PM_BUSY:
return -EBUSY;
case GB_CONTROL_INTF_PM_NA:
return -ENOMSG;
default:
return -EREMOTEIO;
}
}
int gb_control_interface_suspend_prepare(struct gb_control *control)
{
struct gb_control_intf_pm_response response;
int ret;
ret = gb_operation_sync(control->connection,
GB_CONTROL_TYPE_INTF_SUSPEND_PREPARE, NULL, 0,
&response, sizeof(response));
if (ret) {
dev_err(&control->dev,
"failed to send interface suspend prepare: %d\n", ret);
return ret;
}
if (response.status != GB_CONTROL_INTF_PM_OK) {
dev_err(&control->dev, "interface error while preparing suspend: %d\n",
response.status);
return gb_control_interface_pm_status_map(response.status);
}
return 0;
}
static ssize_t vendor_string_show(struct device *dev,
struct device_attribute *attr, char *buf)
{

1
drivers/staging/greybus/control.h
View File

@ -56,4 +56,5 @@ int gb_control_bundle_suspend(struct gb_control *control, u8 bundle_id);
int gb_control_bundle_resume(struct gb_control *control, u8 bundle_id);
int gb_control_bundle_deactivate(struct gb_control *control, u8 bundle_id);
int gb_control_bundle_activate(struct gb_control *control, u8 bundle_id);
int gb_control_interface_suspend_prepare(struct gb_control *control);
#endif /* __CONTROL_H */

15
drivers/staging/greybus/greybus_protocols.h
View File

@ -130,6 +130,7 @@ struct gb_protocol_version_response {
#define GB_CONTROL_TYPE_BUNDLE_RESUME 0x10
#define GB_CONTROL_TYPE_BUNDLE_DEACTIVATE 0x11
#define GB_CONTROL_TYPE_BUNDLE_ACTIVATE 0x12
#define GB_CONTROL_TYPE_INTF_SUSPEND_PREPARE 0x13
struct gb_control_version_request {
__u8 major;
@ -214,6 +215,20 @@ struct gb_control_bundle_pm_response {
__u8 status;
} __packed;
/*
* Interface Suspend Prepare and Deactivate Prepare operations use the same
* response layout and error codes. Define a single response structure and reuse
* it. Both operations have no payload.
*/
#define GB_CONTROL_INTF_PM_OK 0x00
#define GB_CONTROL_INTF_PM_BUSY 0x01
#define GB_CONTROL_INTF_PM_NA 0x02
struct gb_control_intf_pm_response {
__u8 status;
} __packed;
/* APBridge protocol */
/* request APB1 log */